Guide for t squares



Apr.'10, 1923.

. A. A. VANDERPOOL GUIDE FOR T-SQUARES Filed Aug. 12, 1922 Patented Apr.10, 1923.

ALBION A. VANDERPOOL, 0F NEWARK, NEW JERSEY.

GUIDE FOR '1 SQUARES.

Application filed August 12, 1922. Serial No. 581,293.

To all whom 2175mm concern:

Be it known that I, ALmoN A. VANDER- rooL, a citizen of the UnitedStates, and a resident of Newark, county of Essex, and State of NewJersey, have invented certain new and useful Improvements in Guides forT Squares, of which the following is a specification.

This invention relates to an improved guide for insuring the smooth andfirm contact of the head of a T-square against the edge of a drawingboard so that the draftsman is relieved of the necessity of observingwhether the head of the square is against the board or not.

The invention has for its object to provide such a guide in which theplacing of the T- square against the board, its manipulation and itsremoval are as easy as with a T- square withoutthe attachment, andfurther, to provide a guide having no parts in the way of the draftsmanto interfere with the normal operation of the square.

The invention is illustrated in the accompanying drawing, in whichFigure'l is a perspective view of the parts constituting the invention,with the drawing board and the T-square indicated in dotted outline.Figure 2 is a section of the edge of the board and part of the T-square,and with the slide and strip of the invention in position. Figure 3 is asection of the slide taken on line 33 in Figure 1, and Figure 4 is aperspective of an abutment used on the slide.

In the drawing the drawing board is indicated at and the T-square isindicated at 11 with the usual head 12 and the blade 13. In the drawingthe head of the T-square is shown as used for securing the slide 14 tosquare, although various places and means for attachment can be used.

In the form shown, the slide 14 is of metal and its two edges 15 and 16are parallel, insuring the same relation of the square to the board aswhen it is omitted. The various sizes of T-square heads can beaccommodated, since the abutment or stop 1'7 is adjustable and is heldin place by the screw 18 preferably operating in a T-slot 19 in theslide 14 and having a nut 20 to bind the head of the screw in the slot.The foot 21 of the abutment or stop 17 engages one end of the head ofthe square, and the binding screw 22 is screwed up tight to hold thehead of the square in the slide. The slide moves freely along the edgeof the board and is held up tight against the board by suitable springs,such as the leaf springs 23 which bear against and slide freely alongthe flange or strip 24, usually in the form of an angle iron andfastened as by the screws 25 to the bottom of the board.

The T-square can be placed against or removed from the board with noparticular manipulation, because the fingers of the hand holding thehead of the square can press in on the springs 23 to enable the slide 14to be slid in edgewise between the strip 24 and the end of the drawingboard.

The advantage of this device is that when the T-square is equipped withit the accidental shifting of the blade of the square is prevented. Itoften occurs that a loose square becomes slightly out of line,especially a long square, and such condition is sometimes present a longtime before it is detected, so that much faulty work must be erased.With this device the head of the square is positively and firmly heldagainst the edge of the board and the square can be slid up and downwithout necessarily taking hold of the head of the square, and can bemoved, if desired, from the blade alone.

I claim:

1. A guide for T-squares comprising a slide for attachment to theguiding edge of the head of the Tsquare, a strip adapted to be securedto a drawing board, and yielding means adapted to be interposed betweenthe slide and the. strip for holding the guide against the drawingboard.

2. The combination of a drawing board and a T-square, with a guidingstrip secured to the board, a slide secured to the square, and spacedsprings interposed between the strip and the slide, said springs beingdisposed to normally force the guide against the board and to permit theedgewise insertion and withdrawal of the slide.

3. The combination of a drawing board and a T-square, with a guidingstrip secured to the board and spaced from its edge, a slide secured tothe head of the square and adapted to be interposed between the saidedge and the strip, and spaced springs on the slide and bearing on thestrip to hold the head of the square against the edge of the board.

4. A guide for T-squares comprising a flatslide having clamping means atits top edge for securing it to the head of a T-square, and havingsprings projecting beyond its face near the bottom, and a track forattachment to a drawing board, said track including a flange to act asan abutment for the springs.

5. A guide for "IF-squares comprising a fiat slide having an adjustingscrew on one end at the top and having an adjustable stop at the otherend, whereby the slide can be secured to the head of a T-square andperpendieular to the blade, and having springs pro jecting beyond itsface near the bottom, and 10 a track for attaohment to a drawing board,said track including a flange to act as an abutment for the springs.

In testimony that I claim the foregoing, I have hereto set my hand, this20th day of 15 July, 1922.

ALBION A. VANDERPOOL.

